<html>

<head></head>

<body style="text-align:center">

    <h2>弹窗</h2>

    <div class="popup" onclick="myFunction()">点我有弹窗!
        <span class="popuptext" id="myPopup">提示信息!</span>
    </div>

    <style>
        /* Popup container - can be anything you want */
        .popup {
            position: relative;
            display: inline-block;
            cursor: pointer;
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            user-select: none;
        }
        
        /* The actual popup */
        .popup .popuptext {
            visibility: hidden;
            width: 160px;
            background-color: #555;
            color: #fff;
            text-align: center;
            border-radius: 6px;
            padding: 8px 0;
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            margin-left: -80px;
        }
        
        /* Popup arrow */
        .popup .popuptext::after {
            content: "";
            position: absolute;
            top: 100%;
            left: 50%;
            margin-left: -5px;
            border-width: 5px;
            border-style: solid;
            border-color: #555 transparent transparent transparent;
        }
        
        /* Toggle this class - hide and show the popup */
        .popup .show {
            visibility: visible;
            -webkit-animation: fadeIn 1s;
            animation: fadeIn 1s;
        }
        
        /* Add animation (fade in the popup) */
        @-webkit-keyframes fadeIn {
            from {opacity: 0;} 
            to {opacity: 1;}
        }
        
        @keyframes fadeIn {
            from {opacity: 0;}
            to {opacity:1 ;}
        }
    </style>

    <script>
        function myFunction() {
            var popup = document.getElementById("myPopup");
            popup.classList.toggle("show");
        }
    </script>
</body>

</html>